Kuttner added a few lesser-known deities to the Mythos, including Iod ("The Secret of Kralitz"), Vorvadoss ("The Eater of Souls"), and Nyogtha ("The Salem Horror"). Critic Shawn Ramsey suggests that Abigail Prinn, the villain of "The Salem Horror", might have been intended by Kuttner to be a descendant of Ludvig Prinn, author of De Vermis Mysteriis—a book created by Robert Bloch that appears in Kuttner's "The Invaders".

Price points out in his introduction to The Book of Iod: Ten Tales of the Mythos that "Henry Kuttner's own private corner of the Cthulhu Mythos was, then, apparently derived in about equal measure from Lovecraft, Bloch, Zoroastrianism, and Theosophy."